Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b469d618016baee…

MALICIOUS

PDF

39.3 KB Created: 2020-08-14 06:02:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1fc2202f3dea635c8a354ef0403f3d98 SHA-1: 362e08f7d4a57e65ea51232d3dadf4e1ea6507a0 SHA-256: 0b469d618016baee6d11206de15d496b6676b487e34045657a37b24550d33ad3
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded links, with one identified as a malicious redirector. The document body, though heavily obfuscated, contains text referencing VBA code and includes the malicious redirector URL. This suggests the document is designed to trick users into visiting the redirector, which likely leads to a malware download. No scripts were extracted, but the presence of embedded links and the ML classifier output strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ttraff.cc/wb?keyword=vba%20code%20to%20set%20worksheet%20name
    • http://files.maranathabaptistcorinth.com/uploads/1/3/2/7/132740637/gavowo.pdf
    • http://files.thgk.org/uploads/1/3/2/8/132814155/22f7effa7c8.pdf
    • http://files.psychologycenterofaustin.com/uploads/1/3/0/9/130969474/bevofo.pdf
    • http://files.allazoleadership.com/uploads/1/3/1/3/131398251/5498bddfdc.pdf
    • http://files.defeet.org/uploads/1/3/0/9/130969633/sedosu_tomogeridadateb_roxukamonawa.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/1789/6089/files/buss_perry_aggression_questionnaire_bpaq.pdf
    • https://cdn.shopify.com/s/files/1/0434/0360/8214/files/42646385970.pdf
    • https://cdn.shopify.com/s/files/1/0430/4211/1650/files/kisosazenidovipebutipukor.pdf
    • https://cdn.shopify.com/s/files/1/0434/2140/1237/files/59325544784.pdf
    • https://cdn.shopify.com/s/files/1/0440/0198/4662/files/carto_cnpj.pdf
    • https://cdn.shopify.com/s/files/1/0430/9906/2426/files/cabinet_ministers_of_tamilnadu_2020.pdf
    • https://cdn.shopify.com/s/files/1/0447/4336/0663/files/65974289242.pdf
    • https://cdn.shopify.com/s/files/1/0432/5369/4626/files/vobuvafejepakapevafom.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/sakemiribukewud.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/92161478626.pdf
    • https://cdn.shopify.com/s/files/1/0435/0600/8216/files/64861405425.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005c23.bin
3e0b89b32fad57e318239bebd881be92b35dfd5bf39685b90d0e0559ddb3c1e7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5C23 5408 bytes
font_01_sfnt_off00006e60.bin
2c598107a6ec6f341b3390b91a48c50eaceeec99ef0d66e65e8ce27ece48658c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6E60 9960 bytes

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